At the heart of the Sira's audio circuit are its superb sounding 5687 twin-triode voltage amplifier and the super linear 6186 cathode follower tubes. We've configured these into an extremely simple audio circuit, but with an elaborate support system of voltage regulators and high impedance current sources to create an optimal operating environment for these tubes.
Think of it this way: the 5687 twin triode and 6186 cathode follower have the potential to amplify your music's audio signal with great integrity. Unfortunately, the potential of these (or any other) great audio tubes can not be realized within the constraints of conventional audio design. This is because tubes require electrically specific operating environments to reach their potential--operating environments that are difficult to provide.
The reason these environments are so hard to provide is that, often, the values that define them are in direct conflict with each other within conventional audio circuit designs. This is where the Sira is unlike more conventional preamplifiers. We've eliminated the conflicting needs within its audio circuits through the use of high impedance current sources in place of both the plate and cathode resistors for the audio tubes. The result is that these tubes can operate in a much more linear manner than in conventional circuits. And, this yields real improvement in audio quality--allowing the music to come through more freely.
The Sira is an all vacuum tube design. We've incorporated vacuum tube-type circuitry for the power supply's rectification, voltage regulation and high impedance current sources. This approach has proven to be the ultimate for providing musical sounding support circuits for the Sira's audio tubes.
The Sira is hand crafted using point-to-point wiring for its audio and power supply circuitry. Its chassis is constructed from thick brushed stainless steel and solid granadillo wood to provide a strong non-magnetic structure for its circuitry. The result is a superior sounding and elegant looking product.
At Emotive Audio, music has always been our inspiration. As with all of our products, we make the Sira to honor the music that will be played through it.
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